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| author | Andy Lutomirski | 2015-03-06 04:19:06 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2015-03-06 08:32:58 +0100 |
| commit | d0a0de21f82bbc1737ea3c831f018d0c2bc6b9c2 (patch) | |
| tree | b7cfb95be9f42d9942d25f607ccfcb05130b1018 /arch/x86/kernel/process.c | |
| parent | x86/asm/entry: Rename 'init_tss' to 'cpu_tss' (diff) | |
| download | kernel-qcow2-linux-d0a0de21f82bbc1737ea3c831f018d0c2bc6b9c2.tar.gz kernel-qcow2-linux-d0a0de21f82bbc1737ea3c831f018d0c2bc6b9c2.tar.xz kernel-qcow2-linux-d0a0de21f82bbc1737ea3c831f018d0c2bc6b9c2.zip | |
x86/asm/entry: Remove INIT_TSS and fold the definitions into 'cpu_tss'
The INIT_TSS is unnecessary. Just define the initial TSS where
'cpu_tss' is defined.
While we're at it, merge the 32-bit and 64-bit definitions. The
only syntactic change is that 32-bit kernels were computing sp0
as long, but now they compute it as unsigned long.
Verified by objdump: the contents and relocations of
.data..percpu..shared_aligned are unchanged on 32-bit and 64-bit
kernels.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/8fc39fa3f6c5d635e93afbdd1a0fe0678a6d7913.1425611534.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 6f6087349231..f4c0af7fc3a0 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -37,7 +37,25 @@ * section. Since TSS's are completely CPU-local, we want them * on exact cacheline boundaries, to eliminate cacheline ping-pong. */ -__visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = INIT_TSS; +__visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = { + .x86_tss = { + .sp0 = (unsigned long)&init_stack + sizeof(init_stack), +#ifdef CONFIG_X86_32 + .ss0 = __KERNEL_DS, + .ss1 = __KERNEL_CS, + .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, +#endif + }, +#ifdef CONFIG_X86_32 + /* + * Note that the .io_bitmap member must be extra-big. This is because + * the CPU will access an additional byte beyond the end of the IO + * permission bitmap. The extra byte must be all 1 bits, and must + * be within the limit. + */ + .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, +#endif +}; EXPORT_PER_CPU_SYMBOL_GPL(cpu_tss); #ifdef CONFIG_X86_64 |